I have three possibilities that I want to run with.

1: Nature Manipulation or the ability to control nature, much like Poison Ivy.

2: Accelerated Probability/Precognition or the ability to see the outcomes and the choices one could make and see the future

3: Light Manipulation or the ability to create and use light

I am leaning towards Accelerated Probability because I've never done something like that before, plus I think it's a power that, at the start, you'd be unsure what to do with it, but in time you could use it and harness it, which would be a good reason to attend the school.